// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package netutil

import (
	"log"
	"net"
	"net/url"
)

var (
	// indirection for testing
	resolveTCPAddr = net.ResolveTCPAddr
)

// ResolveTCPAddrs is a convenience wrapper for net.ResolveTCPAddr.
// ResolveTCPAddrs resolves all DNS hostnames in-place for the given set of
// url.URLs.
func ResolveTCPAddrs(urls ...[]url.URL) error {
	for _, us := range urls {
		for i, u := range us {
			host, _, err := net.SplitHostPort(u.Host)
			if err != nil {
				log.Printf("netutil: Could not parse url %s during tcp resolving.", u.Host)
				return err
			}
			if host == "localhost" {
				continue
			}
			if net.ParseIP(host) != nil {
				continue
			}
			tcpAddr, err := resolveTCPAddr("tcp", u.Host)
			if err != nil {
				log.Printf("netutil: Could not resolve host: %s", u.Host)
				return err
			}
			log.Printf("netutil: Resolving %s to %s", u.Host, tcpAddr.String())
			us[i].Host = tcpAddr.String()
		}
	}
	return nil
}